As for leaving my kit and bike etc when touring alone, I just wheeled my bike into the shop and left it by the door having spoken with either the cashiers or a security guard first.!
I too just go straight into supermarkets with my bike and leave it where everyone can see it. Has a rear wheel lock so someone would have to carry it to steal it. I can only just lift it myself and I’m very strong. If I couldn’t get it through the doors I would leave in front of the windows facing the checkouts, if I felt I was in a nice area, just taking my bar bag in with my valuables.
I haven’t cycled with anyone yet, other than half a day with 9 guys going in the same direction in France, and that was nice. Everyone keeping each other going at a pace. I only say a couple of other cycle tourists in the whole time I was in Spain, and they were passing the other way. In France there were hundreds, France seems an easy target for touring as there are cycle paths everywhere and public toilets, I didn’t see a single public toilet in Spain and very few cycle paths other than along a beach.
I will be catching up wth a guy in Greece probably who is cycling the world and we said we would meet up. A couple of friends in Thailand too and one named Leana who I hope to catch up with there who has cycled over 150k and 80 countries. Very impressive and in her early 60’s.